Tether

Tether Operations Limited is the issuer of USD₮ (USDT), the largest stablecoin by circulating supply, along with XAU₮ (gold-backed), USA₮ and EUR₮ tokens issued across Ethereum, Tron, TON, Solana, Bitcoin/Liquid, Avalanche, Polygon, Arbitrum, Plasma and other chains. Beyond token issuance, Tether ships a developer surface centred on the open-source Wallet Development Kit (WDK) — a modular, self-custodial multi-chain wallet framework distributed as @tetherto/* npm packages, a WDK CLI, a React Native UI kit, an MCP Toolkit that exposes 35 wallet, pricing, indexer, swap, bridge, lending and fiat tools to AI agents, a published Agent Skill, and the hosted WDK Indexer REST API (wdk-api.tether.io) for token balances and transfer history. Tether also operates the QVAC local-AI SDK, the Tether Wallet app, and a public bug-bounty program.

Tether publishes 5 APIs on the APIs.io network, including API Keys API, Chains API, Health API, and 2 more. Tagged areas include Company, Stablecoins, Cryptocurrency, Blockchain, and Wallets.

Tether’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, signup flow, CLI, and 27 more developer resources.

🌐 Visit website 📡 Source on GitHub

54.6/100 strong ▬ flat Agent 33/100 agent ready saas Full breakdown ↓
scored 2026-09-06 · rubric v0.19.0

1 APIs 1 MCP Servers

Company Stablecoins Cryptocurrency Blockchain Wallets Digital Assets Payments Self-Custody Multi-Chain Agents MCP Open-Source

Kin Score

Kin Score How this is scored →
scored 2026-09-06 · rubric v0.19.0

Composite quality — 54.6/100 · strong

Contract Quality 10.4 / 21

Developer Ergonomics 14.6 / 17

Access Clarity 5.8 / 17

Operational Transparency 6.7 / 11

Contract Governance 0.5 / 10

Discoverability 6.5 / 9

Regulatory Posture 7.3 / 15

Agent readiness — 33/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Payments regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/tether: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 5

Individual APIs this provider publishes, each with its own machine-readable definition.

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Tether MCP Server

MCP SERVER

Rate Limits 1

Documented rate limits and quota policies.

Get Started 4

Portal, sign-up, and the first successful call

DeveloperPortal

GettingStarted

SignUp

Sandbox

Documentation 3

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

OpenAPI

OpenAPI

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

MCPServer

AgentSkill

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Components

Conventions

ErrorCatalog

DataModel

Lifecycle

Conformance

Build 5

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

Packages

SDKs

CLI

ToolCrosswalk

Access & Security 4

Authentication, authorization, and security posture

Security

Security

Authentication

Authentication

DomainSecurity

DomainSecurity

VulnerabilityDisclosure

VulnerabilityDisclosure

Operate 3

Status, limits, changes, and where to get help

Support

Support

RateLimits

RateLimits

ChangeLog

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: tether
name: Tether
description: Tether Operations Limited is the issuer of USD₮ (USDT), the largest stablecoin by circulating supply, along with
  XAU₮ (gold-backed), USA₮ and EUR₮ tokens issued across Ethereum, Tron, TON, Solana, Bitcoin/Liquid, Avalanche, Polygon,
  Arbitrum, Plasma and other chains. Beyond token issuance, Tether ships a developer surface centred on the open-source Wallet
  Development Kit (WDK) — a modular, self-custodial multi-chain wallet framework distributed as @tetherto/* npm packages,
  a WDK CLI, a React Native UI kit, an MCP Toolkit that exposes 35 wallet, pricing, indexer, swap, bridge, lending and fiat
  tools to AI agents, a published Agent Skill, and the hosted WDK Indexer REST API (wdk-api.tether.io) for token balances
  and transfer history. Tether also operates the QVAC local-AI SDK, the Tether Wallet app, and a public bug-bounty program.
url: https://raw.githubusercontent.com/api-evangelist/tether/refs/heads/main/apis.yml
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - rate-limits
  - security
  - sandbox
  generated: '2026-09-03'
  method: derived
image: https://tether.io/wp-content/themes/tether-io-theme/assets/images/logo.svg
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.23'
created: '2026-08-05'
modified: '2026-08-05'
tags:
- Company
- Stablecoins
- Cryptocurrency
- Blockchain
- Wallets
- Digital Assets
- Payments
- Self-Custody
- Multi-Chain
- Agents
- MCP
- Open-Source
tags_raw:
- Company
- Stablecoins
- Cryptocurrency
- Blockchain
- Wallets
- Digital Assets
- Payments
- Self-Custody
- Multi-Chain
- Agents
- MCP
- Open Source
apis:
- aid: tether:tether-api-keys-api
  name: Tether API Keys API
  description: The API Keys API from Tether — 2 operation(s) for api keys.
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - APIKeys
  tags_raw:
  - API Keys
  properties:
  - type: OpenAPI
    url: openapi/tether-api-keys-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
- aid: tether:tether-chains-api
  name: Tether Chains API
  description: Supported blockchains and token discovery
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - Chains
  properties:
  - type: OpenAPI
    url: openapi/tether-chains-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
- aid: tether:tether-health-api
  name: Tether Health API
  description: Server health and status checks
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/tether-health-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
- aid: tether:tether-token-balances-api
  name: Tether Token Balances API
  description: Query current token balances for addresses
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - Token Balances
  properties:
  - type: OpenAPI
    url: openapi/tether-token-balances-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
- aid: tether:tether-token-transfers-api
  name: Tether Token Transfers API
  description: Query token transfer history for addresses
  humanURL: https://docs.wdk.tether.io/tools/indexer-api
  baseURL: https://wdk-api.tether.io
  tags:
  - Token Transfers
  properties:
  - type: OpenAPI
    url: openapi/tether-token-transfers-api-openapi.yml
  - type: Documentation
    url: https://docs.wdk.tether.io/tools/indexer-api
  - type: APIReference
    url: https://docs.wdk.tether.io/tools/indexer-api/api-reference
  - type: GettingStarted
    url: https://docs.wdk.tether.io/tools/indexer-api/get-started
  - type: SignUp
    url: https://wdk-api.tether.io/register
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Website
  url: https://tether.io/
- type: DeveloperPortal
  url: https://docs.wdk.tether.io/
- type: Documentation
  url: https://docs.wdk.tether.io/
- type: APIReference
  url: https://docs.wdk.tether.io/sdk/all-modules
- type: GettingStarted
  url: https://docs.wdk.tether.io/sdk/get-started
- type: Support
  url: https://docs.wdk.tether.io/overview/support
- type: Blog
  url: https://tether.io/news/
- type: GitHubOrganization
  url: https://github.com/tetherto
- type: SignUp
  url: https://wdk-api.tether.io/register
- type: TermsOfService
  url: https://tether.io/terms/
- type: PrivacyPolicy
  url: https://tether.io/privacy/
- type: Security
  url: https://tether.io/bug-bounty/
- type: OpenAPI
  url: openapi/_original/tether-wdk-indexer-openapi-original.yml
- type: Overlay
  url: overlays/tether-wdk-indexer-overlay.yaml
- type: LLMsTxt
  url: llms/tether-llms.txt
- type: Packages
  url: packages/tether-packages.yml
- type: SDKs
  url: packages/tether-packages.yml
- type: CLI
  url: cli/tether-cli.yml
- type: Components
  url: components/tether-components.yml
- type: MCPServer
  url: mcp/tether-mcp.yml
- type: ToolCrosswalk
  url: mcp/tether-tool-crosswalk.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Authentication
  url: authentication/tether-authentication.yml
- type: Conventions
  url: conventions/tether-conventions.yml
- type: RateLimits
  url: rate-limits/tether-rate-limits.yml
- type: ErrorCatalog
  url: errors/tether-problem-types.yml
- type: DataModel
  url: data-model/tether-data-model.yml
- type: Lifecycle
  url: lifecycle/tether-lifecycle.yml
- type: ChangeLog
  url: changelog/tether-changelog.yml
- type: Conformance
  url: conformance/tether-conformance.yml
- type: Sandbox
  url: sandbox/tether-sandbox.yml
- type: WellKnown
  url: well-known/tether-well-known.yml
- type: DomainSecurity
  url: security/tether-domain-security.yml
- type: VulnerabilityDisclosure
  url: security/tether-vulnerability-disclosure.yml
x-enrichment:
  date: '2026-08-05'
  status: enriched
  artifacts_added: 24
  pass: local-v1

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Tether

Kin Score

APIs 5

Tether API Keys API

Tether Chains API

Tether Health API

Tether Token Balances API

Tether Token Transfers API

Open Collections 6

API Collection

WDK Indexer API Keys API

WDK Indexer Chains API

WDK Indexer Health API

WDK Indexer Token Balances API

WDK Indexer Token Transfers API